18921146 has 4 divisors (see below), whose sum is σ = 28381722. Its totient is φ = 9460572.

The previous prime is 18921143. The next prime is 18921167. The reversal of 18921146 is 64112981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 525625 = 4289^2 + 725^2 .

It is not an unprimeable number, because it can be changed into a prime (18921143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4730285 + ... + 4730288.

Almost surely, 2^18921146 is an apocalyptic number.

18921146 is a deficient number, since it is larger than the sum of its proper divisors (9460576).

18921146 is an equidigital number, since it uses as much as digits as its factorization.

18921146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460575.

The product of its digits is 3456, while the sum is 32.

The square root of 18921146 is about 4349.8443650319. The cubic root of 18921146 is about 266.4705053910.

The spelling of 18921146 in words is "eighteen million, nine hundred twenty-one thousand, one hundred forty-six".